Final answer:
To estimate 7/9 as a decimal, we compare it to benchmarks of familiar fractions, finding that the best estimate is approximately 0.8.
Step-by-step explanation:
The question asks which decimal is the best estimate of the fraction 7/9. To estimate this, you can either perform the division directly or compare the fraction to known benchmarks. The fraction 7/9 is just short of being equal to the whole, and it is more than half.
The decimal equivalents of familiar fractions like 1/2, 2/3, and 3/4 are 0.5, 0.67, and 0.75, respectively. Clearly, 7/9 is between 2/3 and a whole (which would be 1.0 in decimal form). The closest given estimate is that 7/9 is approximately 0.8, which is answer D. The actual decimal for 7/9 is about 0.778, which rounds to 0.8 when estimating.